The best results come from focusing your efforts on the parts of a process that you can control. You can’t control the final grade your Spanish teacher gives you, how many spots are available in AP chem, or whether or not your dream college admits you.
But you can control your effort you’re willing to exert. You can control your attitude towards to process, how willing you are to look beyond prestigious colleges, and your confidence to know that a test score or a decision from one college doesn’t have to determine your success in life.
Most college admissions anxiety and frustration comes from trying to control things you don’t get to control. When you feel it happening to you, refocus on those things that you, not somebody else, gets to decide.